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प्रश्न
The speed of light is maximum in ______.
विकल्प
vacuum
glass
diamond
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उत्तर
The speed of light is maximum in vacuum
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संबंधित प्रश्न
State whether light slows down or speeds up in the following cases :
Light going from water to air.
A light ray passes from water to
- air, and
- glass.
In each case, state how does the speed of light change.
A light ray suffers reflection and refraction at the boundary in passing from air to water. Draw a neat labelled ray diagram to show it.
Compare the speeds of light of wavelength 4000 Å (i.e. violet light) and 8000 Å (i.e. red light) in vacuum.
Numerical problem.
Light enters from air into a glass plate having refractive index 1.5. What is the speed of light in glass? (Ans: 2 × 108 ms–1)
Higher Order Thinking Skills.
Light ray emerges from water into air. Draw a ray diagram indicating the change in its path in water.
Light travels ______ kilometers per second in air or vacuum. In theory, nothing can travel faster than light.
Materials that allow light to pass through completely are known as ______ material.
Objects that allow light to pass through partially are called ______ material.
Materials that are not able to allow light to pass through, are called ______ material.
